C
從句意看出是已經(jīng)用過了,所以用完成時；因為前面是every,而means 單復(fù)同型,這里是單數(shù),所以選C
Every possibles means （ ）to prevent the air pollution,but the sky is still not clear.
Every possibles means （ ）to prevent the air pollution,but the sky is still not clear.
A.is used B.are used C.has been used D.have been used
哪一個?為什么?
A.is used B.are used C.has been used D.have been used
哪一個?為什么?
英語人氣：798 ℃時間：2020-05-13 06:57:38
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